System Error shutting down windows 7 remotely

I have two computers in the same network.iopex59 and iopex61 (the host-names). I have verified the IP address. It is the same network. I have admin privileges to both of them. Still I m not remotely allowed to shutdown one from the other. I tried shutdown –m \\iopex61 –r –f –c “The computer will restart, please save all work.” –t 60 from iopex59.I even tried shutdown -i still no luck...What to do?

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